This one's taking a while, but will be worth the wait.  I'm using a "Playboy by Don Diego Box" which is a very nice box (I've used them before).  This one will have 2 pickups ... one Magnetic Pickup from a Fender Strat, and a Piezo Pickup embedded in the Purpleheart & Brass bridge.  Haven't figured out the schematics of how I'll wire it up yet, but will keep you posted.  I'm using the same vintage Gibson tuners as used on the Ole Vintage Uke posted earlier.  Lots of neat features to be added.  Keep in touch!